WO2020160733A1 - Boîtier d'antenne pour lecteurs rfid, en particulier pour des applications de table, notamment dans le domaine de la technologie médicale et lecteur rfid comprenant un tel boîtier d'antenne - Google Patents

Boîtier d'antenne pour lecteurs rfid, en particulier pour des applications de table, notamment dans le domaine de la technologie médicale et lecteur rfid comprenant un tel boîtier d'antenne Download PDF

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Publication number
WO2020160733A1
WO2020160733A1 PCT/DE2020/100082 DE2020100082W WO2020160733A1 WO 2020160733 A1 WO2020160733 A1 WO 2020160733A1 DE 2020100082 W DE2020100082 W DE 2020100082W WO 2020160733 A1 WO2020160733 A1 WO 2020160733A1
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WO
WIPO (PCT)
Prior art keywords
antenna
antenna box
housing
field
box according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DE2020/100082
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German (de)
English (en)
Inventor
Armin Schorer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ASANUS MEDIZINTECHNIK GmbH
Original Assignee
ASANUS MEDIZINTECHNIK GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ASANUS MEDIZINTECHNIK GmbH filed Critical ASANUS MEDIZINTECHNIK GmbH
Priority to DE112020000739.1T priority Critical patent/DE112020000739A5/de
Priority to EP20716690.1A priority patent/EP3921765B1/fr
Publication of WO2020160733A1 publication Critical patent/WO2020160733A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
    • G06K7/10336—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the near field type, inductive coil

Definitions

  • the invention relates to an antenna box for RF ID reading devices, in particular for table applications, in particular in the field of medical technology, and an RFID reading device with such an antenna box.
  • RFID readers are always used here for the sake of brevity, this term serves as a generic term for pure RFID readers, combined reading and writing devices and pure RFID writing devices, as - as can be seen from the following disclosure for the A person skilled in the art gives - the technical solution described here
  • RFID tags also referred to as radio tags, but is equally suitable for specifically writing radio tags.
  • RFID technology offers great possibilities for recording the instruments, implants and other medical equipment used, if these are marked with RFID tags, generally and non-restrictively referred to here as radio tags, which are known in a wide variety of designs.
  • RFID tags generally and non-restrictively referred to here as radio tags, which are known in a wide variety of designs.
  • the targeted reading of a radio tag is a particular challenge, because on the one hand the object itself can shield the electromagnetic waves used to read the radio tag, and on the other hand it can be used in the reading environment e.g. in an operating theater or a sterile goods department of a hospital where used instruments are cleaned and sterile packed, typically not just many metallic surfaces, e.g. Stainless steel tables, but also many objects marked with radio tags that influence each other.
  • RFID antennas in the UHF range typically generate a spatial
  • individualized identifier are provided, checked and inventoried.
  • the actual reader is connected to an antenna module with the help of a shielded high-frequency cable, which is one for the respective
  • Antenna structures are usually single dipoles or
  • FR-4 a composite material made of epoxy resin and fiberglass fabric, which is used for the UHF frequency range almost without exception, is used as the carrier substrate
  • Substrates made from FR-4 material have a permittivity number that is about four times greater than that of air.
  • UHF-RFID reading technologies in work environments, where the work surfaces are practically without exception made of stainless steel for hygienic reasons for cleaning and disinfection, whereby these are then similar to the electromagnetic UHF field emitted by the antenna module because of their good electrical conductivity highly reflective mirrors or spatially distributed mirror segments. This causes interference with hot or cold spots in the antenna module of the reader
  • the field energy required to activate the radio tag is locally insufficient, although the marked instrument is close to the
  • Antenna module is located. Uncontrolled reflections occur, which means that one and the same radio label generates delayed multiple propagation signals due to reflections on the metal surfaces, which can make the data stored in the radio label considerably more difficult or even impossible to read. This effect is well known in the acoustic field.
  • the loudspeaker announcement in train stations can often not be understood because the overlay of multiple echoes on the walls makes the announcement incomprehensible.
  • the metal environment e.g. In the sterile supply department of a hospital, where it should be recorded which instrument is packed into a certain sterile goods container, resulting in uncontrolled or incomprehensible UHF-RFID read results.
  • Antenna modules are operated simultaneously. Even with a sufficiently large distance between the respective antenna modules, reflections lead to field distortions, interferences, hot spots and cold spots, etc. with uncontrollable effects on the
  • EP 3 200 119 B1 proposes the use of one or more motor-driven "swirlers" in the form of two metal plates each arranged at right angles, which surround the field structure in the metal
  • the method is used in a similar form in every modern microwave oven to ensure that the food is heated evenly, although the swirler is located near the field-generating magnetron and not in the cooking space.
  • WO 2015/018902 A1 proposes a complex automated reading device in which a group of medical instruments marked with radio tags is to be reliably read and identified.
  • the objects to be registered are deposited in a reading chamber that is closed on all sides, in which there are several metal plates as reflectors, which have the task of influencing the field structure in the reading chamber, which is closed on all sides during the reading process, so that there are no errors when reading out the RFID information from Bulkes of marked instruments result.
  • a complex RFID reading line is known from US 2006/0170556 A1, in which objects marked with radio tags are guided by means of a conveyor belt through a tunnel-like shield, inside of which a corresponding antenna module is arranged. Due to its design, such a reading line is not suitable for table applications, especially in the
  • EP 0 918 308 A2 and US 9,830,486 B2 teach baggage belts at airports or the sorting of parcels. These reading streets are also not suitable for table applications of the type mentioned.
  • Antenna arrangement is for applications in operating rooms and
  • the invention is based on the object of specifying an antenna box for RFID readers which, with a particularly simple and compact design, allows radio tags to be sent even in environments with a high proportion of metal surfaces such as e.g. Reliably read and write on operating theaters and sterile goods departments and in the vicinity of many other radio tags.
  • the antenna box should preferably also be placed on metallic objects such as one
  • Stainless steel table can be operated and designed so simply and compactly that it can be easily cleaned and sterilized and used on the move. Furthermore, an RFID reader with analog properties is to be specified, which uses a corresponding antenna box.
  • the invention is based on the basic idea of using an antenna box that is at least partially open on at least one side, preferably on two sides connected to one another, about the size of a shoebox, so that employees can simply hold objects marked with radio tags, such as medical instruments, in the box to the respective radio tag quickly and to be able to read reliably even in metallic surroundings and in the vicinity of other radio tags.
  • radio tags such as medical instruments
  • the antenna box has at least two mutually opposing metallic conductive side walls which are connected to one another by a floor of this type and thereby an upward and preferably forward (viewed from a viewer sitting in front of the box, with "forward" then facing the viewer facing the front of the Box means) to form an open rectangular waveguide, whereby an antenna structure in the form of a dipole or a dipole array is arranged on the bottom of the box and is aligned in such a way that it excites an H20 wave type (by forced switching) during operation in the antenna box.
  • the lateral distance between the named side walls is selected in the range of 10 cm to 25 cm so that the objects marked with radio tags can be inserted without any problems, but the electromagnetic energy fed in by the antenna structure cannot leave the examination area defined by the antenna box.
  • the invention has surprisingly recognized that it is extremely advantageous to use the dipole antenna structure to stimulate a higher wave type, namely the H20 wave type and not the H10 wave type in the waveguide, as is usual with such antenna structures, since this increases the length-related attenuation to open At the end of the antenna box, what a
  • H10 and H20 wave types are sometimes also referred to in the literature as H10 or H20 mode or as TE10 or TE20 mode.
  • the H20 wave type Since, according to the invention, it is excited by a dipole whose open ends point towards the side walls, the H20 wave type is generated. The attenuation takes place through losses caused by wall currents.
  • Fig. 1 shows a highly schematic R Fl D reader according to the prior
  • Fig. 2 shows schematically a section through a first
  • Embodiment of an antenna box according to the invention for an RFID reader Embodiment of an antenna box according to the invention for an RFID reader.
  • Fig. 3 shows schematically a section through a second
  • Embodiment of an antenna box according to the invention for an RFID reader Embodiment of an antenna box according to the invention for an RFID reader.
  • Fig. 4 shows a schematic perspective view of an embodiment of a housing for forming an inventive
  • Fig. 5 shows schematically in plan view an embodiment of a
  • FIG. 6 shows a schematic perspective view of an autarkic RFID reader with an antenna box according to the invention.
  • FIG. 7 shows schematically in a top view an example of an embodiment of an antenna box with an antenna module according to a further embodiment with a special course of a planar feed line and a coaxial bushing attached to the housing for connection to an RFID reader according to FIG. 6.
  • Fig. 8 shows schematically in side view the details of the connections for the construction of an autarkic RFID reader.
  • FIG. 9 shows schematically an embodiment of a spacer.
  • Fig. 10 shows schematically an embodiment of an on a
  • the boundary conditions for the electromagnetic fields are met.
  • the electrical field strength must be at the metallic edges
  • Wave types capable of propagation Since typical waveguides are So-called single-edged waveguides are involved, i.e. when viewed in cross-section, for example, rectangular waveguides show only a single completely metallized edge, it is impossible, for example, to use it alone to transport a direct current, for example to operate a flashlight with the help of a battery.
  • To transport a direct current you need two separate metal lines - one that is connected to the positive pole of the battery and one that is connected to the negative pole of the battery. At the end of the line, the consumer is then connected, for example in the form of an incandescent lamp, which then starts to glow when a contact is made. If you were to connect a rectangular waveguide to the two poles of a battery, it would only short-circuit the battery.
  • An incandescent lamp connected to the end of the waveguide would not light up under any circumstances.
  • the frequency of the direct current from the battery is too low. There is no propagation mode for direct current in a rectangular waveguide.
  • each of the waveguide modes has a frequency-dependent lower limit frequency, and electromagnetic energy with a frequency below this limit frequency through the metallic
  • Boundary is short-circuited and thereby more or less strongly damped, can be used to shield electromagnetic fields, but to let small objects through a remaining opening.
  • Phenomenon is known to the person skilled in the art and is described, for example, in the document US 2006/0170556 A1, in order to transfer transponders on packages in a tubular tunnel in which the readers for the transponders attached to the packages are located and through which the packages, for example with the help of a conveyor belt are transported through to read.
  • the respective openings of the tunnel are dimensioned in such a way that the electromagnetic fields generated within the tunnel by the reading devices cannot pass through the tunnel openings because their geometric dimensions are so small that the electromagnetic fields required, but not achieved, due to the required but not achieved high ones resulting from the dimensions
  • the antenna box for forming the near field of an RFID reader for radio tags is designed as a waveguide, the lowest cut-off frequency of which is approximately 1.5 times or more higher than the operating frequency required to operate the radio tags
  • the waveguide is closed at one end by a metallic conductive wall so that it forms a bottom of the antenna box, and at its other end is open, the total length of the waveguide at least a quarter to a third of the wavelength for operation the radio tags required
  • the antenna box is designed as a rectangular waveguide with a plurality of side walls, which is metal-sealed at least on one side, the antenna box then e.g. can consist of a rigid cuboid housing made of sterilizable housing material, which is at least partially open on at least one side, preferably on two sides.
  • the waveguide has a bottom and
  • the antenna box has one or more side walls, then these and the base can either be metallically conductive themselves or provided with a metallically conductive foil so that they form a side wall shield and a bottom shield.
  • a corresponding film can be a self-adhesive film with a thickness in the range from approximately 0.2 to 0.8 mm, preferably approximately 0.4 to 0.6 mm.
  • Side walls have a recess open towards the open end of the waveguide, which facilitates the introduction of radio tags into the interior of the antenna box, so that e.g. individual instruments can be recorded quickly and efficiently at a packing table if the antenna box is part of an RFID reader.
  • An RFID reader for detecting objects marked with radio tags typically comprises an antenna module with a resonant antenna structure for reading out corresponding radio tags, the antenna module being arranged in the area of the floor of an antenna box according to the invention so that its resonant antenna structure radiates towards the open end of the waveguide.
  • the waveguide of the antenna box then advantageously allows the field of the
  • the resonant antenna structure of the antenna module is applied to a dielectric carrier substrate, as a result of which the geometric length that the antenna structure must have to emit the high-frequency field required for reading the radio tags is reduced to at least about half compared to the length without a substrate and therefore is less than the width of the waveguide.
  • the antenna module is guided through a feed-through opening in the antenna box
  • High-frequency line connected to control and evaluation electronics. According to a method for the targeted detection of an object marked with a radio label using an RFID reader according to the invention, at least the part of the object that bears the radio label is brought into the interior of the waveguide in order to avoid that in the radio label
  • an antenna module 1 is used to generate an electromagnetic field area 2 that is as extensive as possible.
  • the radio tags 3 located in the field area 2, from which
  • radio tag 4 draw their energy required for operation from this field and use this field, for example by rhythmic absorption modulation, at the same time to transmit the in the
  • Radio tags Data stored on radio tags.
  • the respective radio tags are attached to certain objects and thus logistically assigned to these objects.
  • the antenna module 1 is connected by a high-frequency line 5, usually a thin, low-loss coaxial cable, to control and evaluation electronics that are known per se and are therefore not shown here
  • the antenna module on the one hand feeds and on the other hand evaluates and processes the signals received from the radio tags.
  • the arrangement shown here is typical of a UHF system which is approved in Europe in the frequency range of around 868 MHz.
  • the antennas actually effective in the antenna module 1 are generally planar metallic structures that are applied to a carrier substrate 26.
  • an FR-4 substrate is usually used, which is still very useful in this frequency range.
  • the antennas are designed similar to microstrip technology, ie the antenna module used has a carrier substrate 26, a continuously metallized base plate and a suitable base plate on the bottom structured top side with the antenna structures 30 which are always resonant. These can be simple dipoles, crossed dipoles or so-called patch antennas.
  • the generated electromagnetic fields 2 are radiated from the base plate of the substrate in the opposite direction upwards by such antenna structures. A field region 2 is thus generated there, the intensity of which generally decreases quadratically with increasing distance.
  • the field area 2 drawn in dashed lines in FIG. 1 marks the area up to the limit of which the respective radio tags 3 can still draw sufficient operating energy from the electromagnetic field. If the distance is greater, however, the radio tags can no longer be activated because the
  • a whole bunch of radio tags can be activated simultaneously. This is for a certain constellation such as the recording of tools marked with these radio tags in one
  • radio tags for the 868 MHz range can still be operated at a distance of six meters without any problems.
  • FIG. 1 A solution to the problem is shown schematically in FIG.
  • the antenna module 1 is partially enclosed by an antenna box made of a suitable material, as a result of which a modified field area 9 is now created when the antenna module 1 is in operation.
  • Fig. 2 only a cross-sectional drawing is shown for explanation. It can be seen how the antenna module 1 from a base 6, a left side wall 7 and a right side wall 8 of an antenna box according to a first
  • the Antenna box also has a front wall, which is not shown here, and a rear wall 12.
  • the antenna module is in turn, as is also the case with the embodiments described below, connected via a high-frequency line 5 to control and evaluation electronics, which feed the antenna module on the one hand and on the other evaluates and processes the signals received from the radio tags, so that the antenna module, together with the control and evaluation electronics connected via the high-frequency line 5, in its entirety and in particular with the antenna device 20 modified in this way, already forms a first RFID reader, which in principle uses radio tags individually and can examine specifically.
  • the material for the walls of the antenna box is metallically conductive, but also has a damping effect in the UHF range.
  • Different realizations for field shaping are possible. Copper plates are rather unsuitable due to their high conductivity, because they can cause too much interference.
  • a conductive paint with silver particles or a poorly conductive graphite spray usually results in too thin layers that can be penetrated by the formation of eddy currents from the side of the intensive UHF field in the vicinity of the antenna module.
  • Attenuation of the electromagnetic fields in the frequency range used and the material thickness can be optimized for the respective application.
  • FIG. 2 shows schematically how a radio tag 4 to be selected can be activated individually with the aid of the antenna box by inserting it into a
  • FIG. 2 also shows the basic structure of the antenna module 1, in which the left-hand dipole metallization 22 and right-hand dipole metallization 24 of a dipole are arranged on a carrier substrate 26 and thus form a resonant antenna structure.
  • the shape of the area with a sufficiently high field energy can be adapted to the respective requirements.
  • 3 shows schematically as a cross-sectional drawing such a variation which forms a second exemplary embodiment of a modified antenna device 20.
  • the left side wall 7 and the right side wall 8 in this variation are not at an angle of 90 degrees to the bottom of the panel, but at an angle of approximately 110 degrees each.
  • the modified field area 9 is significantly enlarged, as a result of which two additionally selected radio tags 10 can be activated in this explanatory figure.
  • the antenna box can be designed variably to form the near field of RFID readers.
  • a type of fixable hinge device only needs to be attached between the base 6 and the respective side walls 7 and 8.
  • the field area modified according to the invention can be individually adapted to the respective requirements.
  • Fig. 4 shows schematically an embodiment of a sterilizable empty housing 28 for forming an antenna box with parallel walls.
  • the housing 28 consists of a sterilizable material which is light in weight but provided with sufficient rigidity.
  • the housing 28 forms the outer skeleton for the actual antenna box. Therefore, apart from the two requirements, namely rigidity and sterilizability, no further conditions are absolutely necessary for the function of the antenna box. In particular, it does not matter whether the housing is made of suitable plastic or, for example, stainless steel, since the characteristic electrical Properties are determined by the additional components explained in connection with FIG. For simple purposes, however, a corresponding simple housing made of stainless steel would already be sufficient.
  • the housing shown in Fig. 4 has a left housing wall 11, a
  • Housing back 12 a right housing wall 13, a housing front 14 and a housing bottom 15.
  • the housing is cuboid and open at the top, i. H. it has no lid.
  • the housing front side 14 is significantly lower than the other housing walls, as a result of which the introduction of objects to be examined which have been marked with radio tags is made considerably easier.
  • the housing walls 11 and 13 and the rear side 12 of the housing are each approximately 12 cm high.
  • the rear side of the housing 12 and the front side 14 of the housing are approximately 15 cm wide, with the front side 14 being only approximately 5 cm high.
  • the total outer length of the case is about 24 cm.
  • a feed-through opening 16 is provided for passing through the high-frequency line 5 so that an antenna module 1, which is later introduced into the housing 28, can be fed by the control and evaluation electronics.
  • the housing is lined with a suitable material on the respective inner sides of the housing walls.
  • the material for the shielding is of more significant importance in electrical terms.
  • a self-adhesive 0.4 mm thick lead-containing film has been used, the lead being encapsulated in such a way that it is not exposed and there is no damage to health, for example through contact with the Skin.
  • other materials can also be used.
  • the metallic properties of lead cause the electrical fields to short circuit due to its electrical conductivity.
  • the conductivity in the UHF range is significantly lower than is the case with copper or silver, which means that disruptive reflections on the respective walls are attenuated by the electrical losses that occur at the same time.
  • the antenna structure 30 is normally covered by the respective housing of the antenna module 1.
  • the top of the antenna module 1 in FIG. 5 is assumed to be transparent, so that the structured surface of the active antennas can be viewed directly.
  • the antenna structure 30 is formed by three dipoles which are interconnected to form a radiator arrangement and which are on one
  • Carrier substrate surface 32 are arranged.
  • the antenna structure 30 is dipole antennas coupled to one another, a so-called antenna array. These individual dipole antennas are always operated resonantly so that they can function effectively.
  • the electrical effectiveness of the antenna structure 30 always corresponds to half a wavelength at the respective operating frequency.
  • the wavelength can therefore be calculated exactly for an operating frequency in the UHF range of 868 MHz.
  • the electrically effective wavelength is significantly dependent on the respective medium with which the dipole fields are linked.
  • the resonant dipoles shown in FIG. 5 are located in the antenna structure 30 of the antenna module on an FR-4 material as a carrier substrate. This shortens the geometric or also mechanical length of the metallization of each dipole located on the carrier substrate surface 32, i.e. both the left-hand dipole metallization 22 and the right-hand dipole metallization 24 with the square root of the permittivity number of the substrate used, i.e. in the case of FR4 substrate, different depending on the manufacturer , but at least by 100%.
  • the wavelength associated with a frequency of 868 MHz in the air is about 35 cm.
  • the half wavelength associated with a frequency of 868 MHz in an FR-4 substrate is approximately 8.6 cm. This is the approximately required length for the dipole and corresponds approximately to the minimum required width of the antenna module. With a wall thickness of about 1 cm of the
  • the field structure in this rectangular waveguide formed in this way is predetermined by circuitry.
  • the aperture width BB determines the characteristic electrical behavior of the electromagnetic energy it contains.
  • Radio tags are to be implemented as the compactest possible, handy table-top device that can be used in medical rooms, it is not sufficient to use only a rectangular waveguide as a screen or shield
  • Cutoff frequency is above the operating frequency of the radio tags used and thus attenuates the field.
  • the amount of attenuation would not take place quickly enough along the extension of the waveguide.
  • Radio tags which can have a range of up to 6 meters, cannot be examined in a simply dampened waveguide field. To do this, the opening would have to be reduced to such an extent that medical devices for examination can hardly be inserted into the examination chamber 21.
  • Examination chamber can be extended up to half a meter high in order to cause sufficient damping of the field generated by the readers. This would be so unwieldy that this solution would be difficult to put into practice.
  • Results because the electromagnetic field in the examination chamber would be very inhomogeneous and the field structure can change locally with varying high frequency power.
  • the inspection process is delayed by an additional electronic setting process or even by manual setting with the aid of a rotary control and is also no longer safe from possible manipulation. A fixed assignment of field strength and distance from antenna structure 30 would then be the optimum to be striven for.
  • Rectangular waveguide take place, although the lateral dimensions must be large enough so that larger medical instruments can still be introduced into the antenna box, the solution described below is required.
  • the antenna structure 30 of the antenna module 1 is designed and arranged so that the H10 fundamental wave of the rectangular waveguide with its lower Cutoff frequency is not excited, but the H20 wave is excited with its cutoff frequency twice as high with the aid of antenna structure 30.
  • Dispersion curves show an exponentially increasing attenuation curve.
  • the attenuation of the field as a function of the distance from the antenna structure 30 is not just twice as high, but increases exponentially with increasing distance H.
  • the H20 wave is explicitly excited by the antenna structure 30 specifically used here according to the invention in connection with the set task, because the dipole structure recognizable in FIG. 5 has a voltage maximum at each of its open, i.e. idle ends.
  • the boundary conditions in the waveguide require a voltage minimum on the respective outer walls.
  • the aperture width BB would have to be at least 35 cm wide in the frequency range under consideration. However, it is only typically about 10 to 16 cm, so not even half as wide.
  • the antenna module is thus electrically and physically located within a waveguide arrangement delimited by metallic conductive walls
  • the frequency range of 868 MHz is far below its cut-off frequency of the H20 wave type and therefore no undamped propagation of the
  • the dipole arrangement of the antenna module 1 can be mechanically introduced into the antenna box and there can also generate a local electromagnetic near field within the antenna box for feeding and reading radio tags, this electromagnetic field cannot propagate outwards along the side walls. It is advantageous in the
  • Antenna device 20 reliably only detects radio tags that are introduced into the interior.
  • Dipole metallization 24 and the adjacent right side wall can be seen.
  • the dipole metallization 22 on the left and the adjacent left side wall 7 can also be seen.
  • the distance between the side walls 7 and 8 determines the cutoff frequency for the H20 wave type. In contrast, those are limited by the rear side 12 and the front side 14 of the housing
  • Sidewall shields 17 are not relevant for the cutoff frequency of the H20 wave type.
  • openings can be provided in the housing front side 14, through which larger and more elongated medical instruments can then be easily introduced into the field area of the examination chamber.
  • An arrangement of several dipole antennas in the manner shown schematically in FIGS. 5 and 7 is therefore also possible in order to achieve a more uniform field distribution for the inspection of elongated medical devices
  • the modified field area can be designed as desired by varying the wall spacing and by widening the walls by changing the angle to the housing base. In the borderline case, i.e. at an angle between the
  • the field area generated by the antenna module 1 behaves as if no diaphragm were present. However, the mechanical complexity for such a variable
  • Antenna box complex and often not required.
  • the user can advantageously decide for himself which version of an antenna box he needs to form the UHF near field of RFID readers.
  • FIG. 6 shows in a schematic way Perspective view as an example of a completely assembled, self-sufficient FRFID reader with an operational examination chamber 21, with one through the
  • the antenna box formed by the side wall shield 17 and an antenna structure 30.
  • the RFID reader 33 is attached to the rear of the examination chamber 21 and connected to the antenna module with the aid of a high-frequency line 40.
  • the housing 28 enclosing the examination chamber 21 with the left housing wall 11, the housing rear side 12, the right housing wall 13 and the housing front 14 can be seen
  • side wall shields 17 are integrated in the housing walls in order to obtain better sterilizability.
  • the antenna structure 30 is schematically indicated, which in the technical implementation is also provided with a sterilizable casing and here only for the better
  • the RFID reader 33 attached to the rear of the examination chamber only has an alphanumeric display device 34 and a signal lamp 35, recognizable from the outside and the front. Of course, a larger display can also be provided to display read information and possibly images to a user.
  • the device can be sterilized.
  • the energy storage device is charged inductively in a contactless manner with the help of external feed fields that are generated in a known manner by special charging stations.
  • the activation of the RFID reader 33 is also carried out without contact with the aid of a switching magnet 36, which for this purpose is in a
  • a signal light 35 enables basic information in a simple manner. If, for example, the radio label of a medical instrument currently being inspected is completely in order, the signal light 35 lights up green; if it is defective, the signal light 35 lights up red and the radio label works in principle, but is already degraded to such an extent that it cannot always be read reliably the signal light 35 lights up yellow. More detailed information can be obtained from the alphanumeric display 34 issued.
  • the RFID reader 33 has an internal one
  • Processor unit with electronic memory for performing
  • FIG. 7 schematically shows the antenna structure already shown in FIG. 5 in a top view. The only difference is the course of the planar ones
  • Feed line for the antenna structure 30 This now leads in a straight line to a feed-through opening in the rear wall 31 and is connected to a coaxial feed-through socket 38 in an electrically conductive manner.
  • This is preferably implemented as an SMA socket and fixed with the help of small screws, for example.
  • the electrical and mechanical connection between the RFID reader 33 and the examination chamber 21 is exemplified in FIG. 8 as one of many
  • a rigid and stable coaxial high-frequency line 40 a so-called semi-rigid cable, provides the electrical and mechanical connections with the aid of a screw connection 39
  • connection between the two modular units creates a self-sufficient RFID reader which, thanks to its portability, can be placed in any suitable free space on the laboratory bench in order to check and control the radio tags on medical instruments.
  • a spacer is included as a simple but effective aid in the
  • FIG. 9 shows schematically and by way of example a spacer such as can be produced, for example, from thin Plexiglas or another non-electrically conductive material with low permittivity.
  • a spacer such as can be produced, for example, from thin Plexiglas or another non-electrically conductive material with low permittivity.
  • Spacers should have at least two different distance levels and should not change after the one-time shaping.
  • a thermoplastic material is very suitable for making this
  • FIG. 10 A typical application scenario is shown in FIG. 10.
  • an exemplary embodiment of an RFID reader located on a laboratory table top 42 with an inserted spacer 41 and a
  • Robotic arm 43 shown.
  • a medical instrument with an integrated radio label 44 is located in the middle level of the spacer at a distance H currently used for inspection.
  • the medical instrument with an integrated radio label 44 was previously either placed on the spacer by the staff or it was positioned there with the aid of the robot arm , where the
  • the robot arm can be controlled wirelessly via WiFi or via Bluetooth connection either directly from the RFID reader or from the hospital's electronic infrastructure with the computers available there.
  • the medical instrument with integrated radio tag can either be manually or electronically automated using the
  • Robotic arm can be exchanged for another object to be examined.

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Details Of Aerials (AREA)

Abstract

L'invention concerne un boîtier d'antenne (20) pour lecteurs RFID, en particulier pour des applications de table, notamment dans le domaine de la technologie médicale, comprenant au moins deux parois latérales (7, 8) métalliquement conductrices opposées l'une à l'autre qui sont reliées entre elles par un fond (6) du même type et forment ainsi un guide d'ondes rectangulaire ouvert sur au moins un côté, de préférence sur deux côtés reliés entre eux. Une structure d'antenne sous la forme d'un dipôle ou d'un réseau de dipôles est disposée au niveau du fond (6) du boîtier d'antenne (20) et est orientée de telle sorte qu'elle excite un type d'onde H20 dans le boîtier d'antenne (20) lors du fonctionnement.
PCT/DE2020/100082 2019-02-07 2020-02-07 Boîtier d'antenne pour lecteurs rfid, en particulier pour des applications de table, notamment dans le domaine de la technologie médicale et lecteur rfid comprenant un tel boîtier d'antenne Ceased WO2020160733A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112020000739.1T DE112020000739A5 (de) 2019-02-07 2020-02-07 Antennenbox für rfid-lesegerate insbesondere für tischanwendungen insbesondere im bereich der medizintechnik und rfid-lesegerät mit einer solchen antennenbox
EP20716690.1A EP3921765B1 (fr) 2019-02-07 2020-02-07 Boîtier d'antenne pour lecteurs rfid, en particulier pour des applications de table, notamment dans le domaine de la technologie médicale et lecteur rfid comprenant un tel boîtier d'antenne

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019103097 2019-02-07
DE102019103097.8 2019-02-07

Publications (1)

Publication Number Publication Date
WO2020160733A1 true WO2020160733A1 (fr) 2020-08-13

Family

ID=70165757

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2020/100082 Ceased WO2020160733A1 (fr) 2019-02-07 2020-02-07 Boîtier d'antenne pour lecteurs rfid, en particulier pour des applications de table, notamment dans le domaine de la technologie médicale et lecteur rfid comprenant un tel boîtier d'antenne

Country Status (3)

Country Link
EP (1) EP3921765B1 (fr)
DE (1) DE112020000739A5 (fr)
WO (1) WO2020160733A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2612804A (en) * 2021-11-11 2023-05-17 Frisense Ltd A radio frequency identification reader

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0918308A2 (fr) 1991-04-03 1999-05-26 Integrated Silicon Design Pty. Ltd Système de triage d'articles
US20020149530A1 (en) * 2001-04-11 2002-10-17 International Business Machines Corporation Dual damascene horn antenna
US20060170556A1 (en) 2005-01-18 2006-08-03 Lexin Technology Inc. System for detecting an RFID tag
US7959751B2 (en) 2006-06-14 2011-06-14 Marketing Technology Service, Inc. Unitized composite fabrics with cross machine wave-like shaping and methods for making same
WO2015018902A1 (fr) 2013-08-09 2015-02-12 Caretag Surgical Aps Enregistrement de matériel médical
US9830486B2 (en) 2014-06-05 2017-11-28 Avery Dennison Retail Information Services, Llc RFID variable aperture read chamber crossfire
EP3200119B1 (fr) 2016-01-29 2018-05-23 Neopost Technologies Système de données d'identification par radiofréquence fonctionnant dans une armoire d'outil

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0918308A2 (fr) 1991-04-03 1999-05-26 Integrated Silicon Design Pty. Ltd Système de triage d'articles
US20020149530A1 (en) * 2001-04-11 2002-10-17 International Business Machines Corporation Dual damascene horn antenna
US20060170556A1 (en) 2005-01-18 2006-08-03 Lexin Technology Inc. System for detecting an RFID tag
US7959751B2 (en) 2006-06-14 2011-06-14 Marketing Technology Service, Inc. Unitized composite fabrics with cross machine wave-like shaping and methods for making same
WO2015018902A1 (fr) 2013-08-09 2015-02-12 Caretag Surgical Aps Enregistrement de matériel médical
US9830486B2 (en) 2014-06-05 2017-11-28 Avery Dennison Retail Information Services, Llc RFID variable aperture read chamber crossfire
EP3200119B1 (fr) 2016-01-29 2018-05-23 Neopost Technologies Système de données d'identification par radiofréquence fonctionnant dans une armoire d'outil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2612804A (en) * 2021-11-11 2023-05-17 Frisense Ltd A radio frequency identification reader
WO2023084020A1 (fr) * 2021-11-11 2023-05-19 Frisense Limited Lecteur d'identification par radiofréquence

Also Published As

Publication number Publication date
DE112020000739A5 (de) 2021-11-04
EP3921765B1 (fr) 2023-11-01
EP3921765A1 (fr) 2021-12-15

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